benchtests/bench-strtok.c

   1 /* Measure strtok functions.
   2    Copyright (C) 2013-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #define TEST_MAIN
  20 #define TEST_NAME "strtok"
  21 #include "bench-string.h"
  22
  23 char *
  24 oldstrtok (char *s, const char *delim)
  25 {
  26   static char *olds;
  27   char *token;
  28
  29   if (s == NULL)
  30     s = olds;
  31
  32   /* Scan leading delimiters.  */
  33   s += strspn (s, delim);
  34   if (*s == '\0')
  35     {
  36       olds = s;
  37       return NULL;
  38     }
  39
  40   /* Find the end of the token.  */
  41   token = s;
  42   s = strpbrk (token, delim);
  43   if (s == NULL)
  44     /* This token finishes the string.  */
  45     olds = rawmemchr (token, '\0');
  46   else
  47     {
  48       /* Terminate the token and make OLDS point past it.  */
  49       *s = '\0';
  50       olds = s + 1;
  51     }
  52   return token;
  53 }
  54
  55 typedef char *(*proto_t) (const char *, const char *);
  56
  57 IMPL (oldstrtok, 0)
  58 IMPL (strtok, 1)
  59
  60 static void
  61 do_one_test (impl_t * impl, const char *s1, const char *s2)
  62 {
  63   size_t i, iters = INNER_LOOP_ITERS_SMALL;
  64   timing_t start, stop, cur;
  65   TIMING_NOW (start);
  66   for (i = 0; i < iters; ++i)
  67     {
  68       CALL (impl, s1, s2);
  69       CALL (impl, NULL, s2);
  70       CALL (impl, NULL, s2);
  71     }
  72   TIMING_NOW (stop);
  73
  74   TIMING_DIFF (cur, start, stop);
  75
  76   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  77
  78 }
  79
  80
  81 static void
  82 do_test (size_t align1, size_t align2, size_t len1, size_t len2, int fail)
  83 {
  84   char *s2 = (char *) (buf2 + align2);
  85   static const char d[] = "1234567890abcdef";
  86 #define dl (sizeof (d) - 1)
  87   char *ss2 = s2;
  88   for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
  89     {
  90       size_t t = l > dl ? dl : l;
  91       ss2 = mempcpy (ss2, d, t);
  92     }
  93   s2[len2] = '\0';
  94
  95   printf ("Length %4zd/%zd, alignment %2zd/%2zd, %s:",
  96           len1, len2, align1, align2, fail ? "fail" : "found");
  97
  98   FOR_EACH_IMPL (impl, 0)
  99   {
 100     char *s1 = (char *) (buf1 + align1);
 101     if (fail)
 102       {
 103         char *ss1 = s1;
 104         for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0)
 105           {
 106             size_t t = l > dl ? dl : l;
 107             memcpy (ss1, d, t);
 108             ++ss1[len2 > 7 ? 7 : len2 - 1];
 109             ss1 += t;
 110           }
 111       }
 112     else
 113       {
 114         memset (s1, '0', len1);
 115         memcpy (s1 + (len1 - len2) - 2, s2, len2);
 116         if ((len1 / len2) > 4)
 117           memcpy (s1 + (len1 - len2) - (3 * len2), s2, len2);
 118       }
 119     s1[len1] = '\0';
 120     do_one_test (impl, s1, s2);
 121   }
 122   putchar ('\n');
 123 }
 124
 125 static int
 126 test_main (void)
 127 {
 128   test_init ();
 129
 130   printf ("%23s", "");
 131   FOR_EACH_IMPL (impl, 0)
 132     printf ("\t%s", impl->name);
 133   putchar ('\n');
 134
 135   for (size_t klen = 2; klen < 32; ++klen)
 136     for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
 137       {
 138         do_test (0, 0, hlen, klen, 0);
 139         do_test (0, 0, hlen, klen, 1);
 140         do_test (0, 3, hlen, klen, 0);
 141         do_test (0, 3, hlen, klen, 1);
 142         do_test (0, 9, hlen, klen, 0);
 143         do_test (0, 9, hlen, klen, 1);
 144         do_test (0, 15, hlen, klen, 0);
 145         do_test (0, 15, hlen, klen, 1);
 146
 147         do_test (3, 0, hlen, klen, 0);
 148         do_test (3, 0, hlen, klen, 1);
 149         do_test (3, 3, hlen, klen, 0);
 150         do_test (3, 3, hlen, klen, 1);
 151         do_test (3, 9, hlen, klen, 0);
 152         do_test (3, 9, hlen, klen, 1);
 153         do_test (3, 15, hlen, klen, 0);
 154         do_test (3, 15, hlen, klen, 1);
 155
 156         do_test (9, 0, hlen, klen, 0);
 157         do_test (9, 0, hlen, klen, 1);
 158         do_test (9, 3, hlen, klen, 0);
 159         do_test (9, 3, hlen, klen, 1);
 160         do_test (9, 9, hlen, klen, 0);
 161         do_test (9, 9, hlen, klen, 1);
 162         do_test (9, 15, hlen, klen, 0);
 163         do_test (9, 15, hlen, klen, 1);
 164
 165         do_test (15, 0, hlen, klen, 0);
 166         do_test (15, 0, hlen, klen, 1);
 167         do_test (15, 3, hlen, klen, 0);
 168         do_test (15, 3, hlen, klen, 1);
 169         do_test (15, 9, hlen, klen, 0);
 170         do_test (15, 9, hlen, klen, 1);
 171         do_test (15, 15, hlen, klen, 0);
 172         do_test (15, 15, hlen, klen, 1);
 173       }
 174   do_test (0, 0, page_size - 1, 16, 0);
 175   do_test (0, 0, page_size - 1, 16, 1);
 176
 177   return ret;
 178 }
 179
 180 #include <support/test-driver.c>